Manufacturing method of manganese oxide catalyst using multi wall carbon nano tube for zinc-air battery and manufacturing method of Cathode for zinc-air battery using thereof

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Nanostructured carbon-based cathode catalysts for nonaqueous lithium-oxygen batteries

Although lithium-ion batteries are traditionally considered to be the most promising candidate for electrochemical energy storage owing to their relatively long cycle life and high energy efficiency, their limited energy density as well as high cost are still causing a bottleneck for their long-term applications. Alternatively, rechargeable Li-O2 batteries have the potential to practically provide 3-5 times the gravimetric energy density of conventional Li-ion batteries. However, the lack of advanced electrode design and efficient electrocatalysts for oxygen reduction-evolution reactions remains as one of the grand challenges before this technology can be commercialized. Among various catalyst formulations, nanocarbon composite materials have been recognized as the most promising ones for Li-O2 batteries because of their reasonable balance among catalytic activity, durability, and cost. In this perspective, the recent progress in the development of nanostructured carbon-based electrocatalysts for nonaqueous Li-O2 batteries is discussed, including metal-free carbon catalysts, transition-metal-nitrogen- carbon composite catalysts, and transition-metal-compounds/nanocarbon catalysts. The morphology-performance correlations of these catalysts are highlighted, aiming to provide guidance for rationally designing advanced catalysts.close5

Spindle-like Mesoporous alpha-Fe2O3 Anode Material Prepared from MOF Template for High-Rate Lithium Batteries

Spindle-like porous alpha-Fe2O3 was prepared from an iron-based metal organic framework (MOF) template. When tested as anode material for lithium batteries (LBs), this spindle-like porous alpha-Fe2O3 shows greatly enhanced performance of Li storage. The particle with a length and width of similar to 0.8 and similar to 0.4 mu m, respectively, was composed of clustered Fe2O3 nanoparticles with sizes of <20 nm. The capacity of the porous alpha-Fe2O3 retained 911 mAh g(-1) after 50 cycles at a rate of 0.2 C. Even when cycled at 10 C, comparable capacity of 424 mAh g(-1) could be achieved.close1307

Spindle-like Mesoporous α‑Fe₂O₃ Anode Material Prepared from MOF Template for High-Rate Lithium Batteries

Spindle-like porous α-Fe₂O₃ was prepared from an iron-based metal organic framework (MOF) template. When tested as anode material for lithium batteries (LBs), this spindle-like porous α-Fe₂O₃ shows greatly enhanced performance of Li storage. The particle with a length and width of ∼0.8 and ∼0.4 μm, respectively, was composed of clustered Fe₂O₃ nanoparticles with sizes of <20 nm. The capacity of the porous α-Fe₂O₃ retained 911 mAh g^–1 after 50 cycles at a rate of 0.2 C. Even when cycled at 10 C, comparable capacity of 424 mAh g^–1 could be achieved

Ketjenblack Carbon Supported Amorphous Manganese Oxides Nanowires as Highly Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Solutions

A composite air electrode consisting of Ketjenblack carbon (KB) supported amorphous manganese oxide (MnOx) nanowires, synthesized via a polyol method, is highly efficient for the oxygen reduction reaction (ORR) in a Zn-air battery. The low-cost and highly conductive KB in this composite electrode overcomes the limitations due to low electrical conductivity of MnOx while acting as a supporting matrix for the catalyst. The large surface area of the amorphous MnOx nanowires, together with other microscopic features (e.g., high density of surface defects), potentially offers more active sites for oxygen adsorption, thus significantly enhancing ORR activity. In particular, a Zn-air battery based on this composite air electrode exhibits a peak power density of similar to 190 mW/cm(2), which is far superior to those based on a commercial air cathode with Mn(3)O(4) catalysts.close543

Designing solvated double-layer polymer electrolytes with molecular interactions mediated stable interfaces for sodium ion batteries

Unstable cathode-electrolyte and/or anode-electrolyte interface in polymer-based sodium-ion batteries (SIBs) will deteriorate their cycle performance. Herein, a unique solvated double-layer quasi-solid polymer electrolyte (SDL-QSPE) with high Na+ ion conductivity is designed to simultaneously improve stability on both cathode and anode sides. Different functional fillers are solvated with plasticizers to improve Na+ conductivity and thermal stability. The SDL-QSPE is laminated by cathode- and anode-facing polymer electrolyte to meet the independent interfacial requirements of the two electrodes. The interfacial evolution is elucidated by theoretical calculations and 3D X-ray microtomography analysis. The Na0.67 Mn2/3 Ni1/3 O2 |SDL-QSPE|Na batteries exhibit 80.4 mAh g-1 after 400 cycles at 1 C with the Coulombic efficiency close to 100 %, which significantly outperforms those batteries using the monolayer-structured QSPE.Ministry of Education (MOE)Submitted/Accepted versionThis work was financially supported by the National Nature Science Foundation of China (No.22209199,52101276). H.J.F. acknowledges the financial support from Ministry of Education, Singapore, by its Academic Research Fund Tier1 (RG85/20) and Tier2 (MOE-T2EP50121-0006)